/*
 * MIT License
 *
 * Copyright (c) 2023 北京凯特伟业科技有限公司
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.je.bpm.common.el;

import com.google.common.collect.Lists;

import javax.el.CompositeELResolver;
import javax.el.ELContext;
import javax.el.ELResolver;
import java.util.*;

/**
 * Builder of {@link ELContext} instances.
 */
public class ELContextBuilder {

    private List<ELResolver> resolvers;
    private Map<String, Object> variables;

    public ELContextBuilder withResolvers(ELResolver... resolvers) {
        this.resolvers = Lists.newArrayList(resolvers);
        return this;
    }

    public ELContextBuilder withVariables(Map<String, Object> variables) {
        this.variables = variables;
        return this;
    }

    public ELContext build() {
        CompositeELResolver elResolver = new CompositeELResolver();
        elResolver.add(new ReadOnlyMapELResolver(new HashMap<>(variables)));
        addResolvers(elResolver);
        return new ActivitiElContext(elResolver);
    }

    private void addResolvers(CompositeELResolver compositeResolver) {
        if(resolvers != null){
            resolvers.forEach(compositeResolver::add);
        }
    }
}
